Click on the visualizer behavior section of the settings page. You will see three options.
1: The framerate of your visuals. You can set this up to 244 frames per second (Depending on the hardware you are running SYQEL on).
2: How many seconds each visual lasts on screen before it cycles to the next visual in your playlist.
3: How long the transition is to each visual in the milkdrop visual feed.
Make sure you save your settings at the bottom!